Revisiting the Liantuo Formation in Yangtze Block, South China: SIMS U–Pb zircon age constraints and regional and global significance
Revisiting the Liantuo Formation in Yangtze Block, South China: SIMS U–Pb zircon age constraints and regional and global significance
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重温华南扬子地块连沱组：SIMS U-Pb锆石年龄限制及区域和全球意义
DOI：
10.1016/j.precamres.2015.03.012
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发表时间：
2015-07
影响因子：
3.8
通讯作者：
Qiu-Li Li
中科院分区：
文献类型：
--
作者：
Xian-Hua Li;Maoyan Zhu;Qirui Zhang;Qiu-Li Li
扬子地块莲沱组的时代和地层对比一直存在争议。关于它与斜水河组、福禄组、长安组或板溪群是否对应，一直存在分歧。莲沱组中已获得一些放射性年龄，但存在继承性问题。本文对莲沱组进行了详细的西姆斯U-Pb研究。莲沱组六个凝灰岩/凝灰质粉砂岩层的放射性测年表明，莲沱组的沉积时间约为2000年。780-714 Ma，与板溪群有对应关系。新时代不仅协调了莲沱组和南沱组的时代-古极点矛盾，为探讨Rodinia超大陆裂解期间扬子地块的演化历史提供了依据，而且强化了Sturtian冰期发生在约1000年的观点。715 Ma，至少在阿拉伯的三个古大陆-努比亚，劳伦西亚和中国南部。YC 20和13 YCB样品中的部分锆石颗粒形成明亮的钙钛矿相畴。690-680 Ma。与岩芯相比，这些区域的稀土总量、微量元素含量和Th/U比值较低。然而，明亮的域和核心显示类似的δ 18 O值低于正常地幔锆石值。这些特征表明，这些领域可能是由沉积后重结晶。
The age and stratigraphic correlation of the Liantuo Formation in the Yangtze Block have been controversial. Disputes diverge on whether it is correlative with the Xieshuihe Formation, the Fulu Formation, the Chang’an Formation or the Banxi Group. Some radiometric dates have been obtained from the Liantuo Formation but they suffer from inheritance. In this paper, we carried out a detailed SIMS U–Pb zircon examination of the Liantuo Formation. Radiometric dates from six tuff/tuffaceous siltstone beds within the Liantuo Formation suggest it was deposited in a time interval of ca. 780–714 Ma, indicating its correlation with the Banxi Group. New ages not only coordinated the age-paleopole contradictions in the Liantuo and Nantuo formations for exploring the evolution history of Yangtze Block during the breakup of Rodinia supercontinent, but also strengthened the viewpoint that the Sturtian glaciation occurred at ca. 715 Ma in at least three paleocontinents of Arabia-Nubia, Laurentia, and South China. Some zircon grains in samples YC20 and 13YCB develop bright domains of ca. 690–680 Ma. These domains have lower total REE, lower trace element contents, and lower Th/U ratios than cores. However, both the bright domains and cores show similar δ18O values lower than the normal mantle zircon values. These characteristics suggest that these domains were possibly formed by post-depositional recrystallization.
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影响因子：
5
作者：
Hoskin, PWO
通讯作者：
Hoskin, PWO
影响因子：
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作者：
Jian Wang;Xian‐Hua Li;T. Duan;Dunyi Liu;B. Song;Zhongxiong Li;Yonghua Gao
通讯作者：
Jian Wang;Xian‐Hua Li;T. Duan;Dunyi Liu;B. Song;Zhongxiong Li;Yonghua Gao
影响因子：
2.4
作者：
Zhang, Shihong;Han, Yigui;Jiang, Ganqing
通讯作者：
Jiang, Ganqing
影响因子：
5.3
作者：
STEIGER, RH;JAGER, E
通讯作者：
JAGER, E
DOI：
10.1016/j.jvolgeores.2009.03.005
发表时间：
2009-05
影响因子：
2.9
作者：
K. McCormack;M. Gee;N. McNaughton;Richard P. Smith;I. Fletcher
通讯作者：
K. McCormack;M. Gee;N. McNaughton;Richard P. Smith;I. Fletcher